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Three new crew members arrive at the International Space Station

The International Space Station (ISS) is at full capacity again after a spacecraft arrived there with new crew members on board. The new team reached the ISS a mere six hours after blasting off from Kazakhstan.

The group will bring the ISS up to its full crew of six and will work on various experiments in biology, biotechnology, physical science and Earth science, according to NASA, which shared a video of the crew as they reached orbit.

Short-staffed and overqualified

In April, Russia decided to reduce the crew of its side of the ISS to just two. In response, the US boosted its crew to four.

Sixty-year-old Italian Nespoli is the most experienced of the new crew, having already spent 174 days in space. He traveled to space once in 2007 and once in 2010.

He shared his enthusiasm in a tweet shortly before the launch.

The future of space exploration

NASA says it will start sending astronauts up to the station using ships developed by SpaceX and Boeing by the end of next year. Both spaceships have room for a fourth person, allowing them to boost the station's overall crew size to seven - once Russia decides to return to full staffing.

Their Soyuz MS spacecraft paired with the space station on timem, six hours after the launch

NASA uses the ISS to prepare for human missions to the moon and Mars and to stimulate commercial space transportation, pharmaceutical research, manufacturing and other businesses.

A total of 15 nations are part of the ISS project - the only manned space station orbiting the earth.